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Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

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Equatorial currents in the Western Indian ocean.

J R Luyten, M Fieux, J Gonella

Science (New York, N.Y.)

|August 1, 1980

Summary

Ocean currents in the equatorial Indian Ocean are dominated by large vertical scales and equatorially trapped motions. Near-surface circulation directly responds to wind variations, forming an eastward jet between monsoons.

Area of Science:

Oceanography
Fluid Dynamics
Meteorology

Background:

Previous studies in 1976 indicated energetic variability on large vertical scales in the equatorial Indian Ocean.
Understanding equatorial ocean dynamics is crucial for climate and weather pattern prediction.

Purpose of the Study:

To investigate the detailed vertical profiles of horizontal current in the western equatorial Indian Ocean.
To analyze the energetic dominance and spatial scales of oceanic variability.
To examine the relationship between near-surface equatorial circulation and wind field variations.

Main Methods:

Conducting measurements in the equatorial Indian Ocean from the Somali coast to 62 degrees E during spring and summer 1979.
Utilizing detailed vertical profiles of horizontal current.

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Employing satellite-tracked drifter buoys to track surface currents.

Main Results:

Energetic variability was dominated by vertical scales of several hundred meters, confined near the equator.
The near-surface equatorial circulation showed a direct response to wind field variations.
A prominent eastward equatorial surface jet was observed, spanning the ocean's width.
Zonal velocity fluctuations exhibited a consistent pattern across the observation region.

Conclusions:

The equatorial Indian Ocean's velocity field is largely influenced by long-term, equatorially trapped motions with extensive zonal scales.
The eastward flow is generated by eastward winds occurring between the northeast and southwest monsoons.
Variability scales suggest a persistent dynamic regime in the region.